Cooling fin



FIG. 1 is a perspective view of a cooling fan showing our new design.

FIG. 2 is a front elevational view thereof.

FIG. 3 is a rear elevational view thereof.

FIG. 4 is a left-side, elevational view thereof.

FIG. 5 is a right-side, elevational view thereof.

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The ornamental design for a cooling fin, as shown.